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To categorize the level of corrosion internally in uncoated offshore wind turbine structures a combinationof different online monitoring systems has successfully been utilized combining findings from onlinecorrosion monitoring, continuous water level monitoring and online water quality monitoring.
Online water level monitoring is being used to identify leakage of the J-Tube seal and evaluatingcorresponding corrosion risks as not all leakages can be identified by manual measurements, which aretypically only performed over a few hours. The findings of the water level monitoring are supplied withwater quality measurements as different levels of leaking will result in different levels of ingress of freshseawater with resulting different levels of dissolved oxygen in the water column. These parameterscharacterizing the environment are then correlated to the corrosion rates measured by online corrosionmonitoring ultimately characterizing the associated corrosion risk of the measured structures.
This approach allows offshore wind turbine structures to be precisely categorized into differentpopulations with different associated corrosion risks, which is the base for evaluating mitigation activities.Positions with a high corrosion risk and high level of ongoing corrosion can be recommended for retrofitwith anodes and positions with a lower risk can be followed using corrosion monitoring, which henceserves as basis for evaluating if mitigation is needed at a later point in time. Further, Electrical Resistance(ER) sensor technology can be used to document arrest of corrosion, where cathodic protection is usedas mitigation measure.
A solution to significantly reduce the internal corrosion of internal areas of offshore monopiles using a highly sophisticated ICCP system. Other technical, electrochemical and installation challenges in of such an ICCP system in confined spaces.
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A test protocol was developed to provide an assessment of the effects of various film defects as well as to perform post-exposure qualitative and quantitative evaluations on eight different coatings systems.
This paper will cover the background of increasing regulations and audits, the reasons why many coatings and fireproofing systems prematurely fail, and also the solutions that may help address these issues that many operators face today.